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Blood total antioxidant status is associated with cortical glucose uptake and factors related to accelerated aging


Identifying cerebral vulnerability in late life is of paramount importance to prevent pathological trajectories of aging before the onset of symptoms. Considerable evidence suggests that impaired antioxidant mechanisms are a fingerprint of aging-related conditions, but there is a lack of human research linking total antioxidant capacity (TAC) measured in peripheral blood to in vivo brain changes and other factors featuring accelerated aging. To address this issue, we have assessed in cognitively normal elderly subjects (N = 100) correlations between serum TAC, using the oxygen radical absorbance capacity assay, surface-based cortical thickness, surface-based 18F-fluorodeoxyglucose positron emission tomography cortical uptake, and different factors associated with accelerated aging [i.e., serum homocysteine (HCY), self-reported memory problems, and self-reported patterns of physical activity]. While no relationship was observed between serum TAC and variations in cortical thickness, decreased TAC level was significantly associated with lower FDG uptake in temporal lobes bilaterally. Remarkably, decreased TAC level was linked to increased HCY concentrations, more subjective memory complaints, and lower frequency of physical activity. Overall, our results suggest that decreased serum TAC level may be helpful to detect vulnerable trajectories of aging.

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This work was supported by research Grants from the Spanish Ministry of Economy and Competitiveness (SAF2017-85310-R to JLC, PSI2017-85311-P to MA); the Regional Ministry of Innovation, Science and Enterprise, Junta de Andalucia (P12-CTS-2327 to JLC); the International Center on Aging CENIE-POCTEP (0348_CIE_6_E to MA); and CIBERNED (CB06/05/1111 to JLC).

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Palomar-Bonet, M., Atienza, M. & Cantero, J.L. Blood total antioxidant status is associated with cortical glucose uptake and factors related to accelerated aging. Brain Struct Funct (2020).

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  • Aging
  • Blood total antioxidant capacity
  • Cortical thickness
  • Homocysteine
  • Subjective memory complaints
  • Physical activity